Did you crawl under the rear axle and see what that rubber fuel hose is doing in between sending unit and hard line?
Again, not to sound like an A-Hole, but have you checked it. With the issues you are having, something is not working as it suppose too.. Just because a part is new or says vented, does not mean it is or is operating the way it should..
The formula you're referring to:I think the problem is that you are not running out of fuel, but running out of air. A 440, according to some of the formulas I've ran across, needs about 800 cfm at 6000 rpm of air flow. While the 650 carb may be jetted like an 800 carb, it can't pull enough air in on top end.
Since air flow may be limited, that may be causing enough vacuum to pull more fuel out of the carb than would be normal.
What size air filter is on the carb? Again, if that's not big enough, that can inhibit air flow as well, and with a small carb, that would not be good.
I may be wrong, but I think if you replace the carb, you'll take care of your problem.
You must have missed my posts previously, wherein I've stated that hose has been replaced and it has been purposely run short and perfectly straight between new fuel line and new sending unit.Did you crawl under the rear axle and see what that rubber fuel hose is doing in between sending unit and hard line?
You must have missed my posts previously, wherein I've stated that hose has been replaced and it has been purposely run short and perfectly straight between new fuel line and new sending unit.
All new.
All straight.
Thanks, but I've been under/over/in that damn thing a BUNCH here lately.No, I saw the post. But I thought mine was fine too until I crawled under there. But yours is probably fine.
Yeah, the old carb formula told me a 650 would be adequate for street use on a mostly stock motor, so I went that route when I got rid of the Holley 3310 and went with the Edelbrock to begin with.So lets do the exercise on your setup. 440CID x 5800RPMS x .85VE of stock manifold / 3456= 627CFM
Now we know in real world conditions @ 5800 rpm's you engine cannot move more than ~627 cfm through the fuel delivery system due to the VE of your setup.
Now would it benefit from a bigger carb? maybe so. Especially at top end but that combo should do just fine with the current carb.
Can you doctor up a remote fuel supply with an electric pump to totally eliminate your current fuel lines?
Maybe borrow a carb to verify there isn't something wrong with yours?
Just trying to help, i know it can be frustrating .
I'm all for that, except for the cost.Time to "shelve" all that carbuerator "BS" and move on to TB fuel injection. Let's face it, in the long run, at the rate your spending time and money on carbs, you could have installed TB twice over. Then again, maybe your issue isn't the carb at all. If it is, all I can say is, jets, floats, chokes, idle adjusting screws and all the other **** that comes with carbs, fu*k that! I wanna start it and go!
Yeah and the only part in the chain at this point I haven't changed AGAIN is the fuel filter.moparedtn-- Almost has to be fuel delivery; think about it, if you're mashed on the throttle the acc. pump is bottomed out, no fuel below it and if you lift throttle it still takes a little bit to fill up that bowl up again. When you get it figured out we are all gonna kick ourselves for not figuring it out!!!
Lots of things have changed since then, honestly - not the least of which is the engine itself.Has this issue been resolved ? Old thread
Read my posts - Click on link
Thanx Scott - Bee 1971
https://board.moparts.org/ubbthread...8896/measuring-fuel-pressure.html#Post2658896
Different
Lots of things have changed since then, honestly - not the least of which is the engine itself.
The "new" 440 I installed in May 2017 is fairly similar to the old one, though - although it does seem to have a bit more *** to it, it's still a warmed over 1972 unit with forged internals and the Mopar 484 purpleshaft cam.
A raggedly "reman" Edelbrock 750 sits on it now that I had to rework to get it working properly - I still need to replace that with a new one for sure.
To answer your question, the car sometimes still will falter in 3rd gear after beating on it all the way from a stop (4 speed), way up in RPM's - it literally falls flat on its' face when it happens, to the point of all but shutting off. I lift off of it, it catches its' breath and we go on like nothing happened.
Definitely a fuel starvation problem at the point it happens - and here's a kicker to the whole thing:
It not only seems to be sensitive to temperature, but to what gas I bought, too.
Ethanol-free stuff does it less. Less than a 90 degree day does it less.
That sort of thing.
My conclusions are many - I have a Howards fuel pump pushrod to install; I want the 800cfm Edelbrock AVS carb for it; and the repro sending unit needs the hell out of there, too.
Oh, P.S.: Sometimes it doesn't do it at all, too.